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POBook Store Database Design
 

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    <p>I'm going to build a book store in which we have 3 entities(classes): Seller,Buyer,Book. I've designed the database as the following details:<br> - Both buyer and seller can buy/sell one or more books respectively.<br> - A buyer needs a seller account if he/she wants to sell a book.<br> - Buyers will offer their price and seller would like to sell to best buyer and I have to save all information among these. </p> <pre> In this model the <em>process</em> class will be the other three classes connector: seller book buyer ------- ------ ------- sID* bID* byID* name --> sID <p>This was my first thought &amp; then I found out that this schema will fail in the process due to a buyer could buy multiple books at same time and there were other reasons, too. so I changed it:</p> <pre> In this model the <em>process</em> class will be the other three classes connector: ______ ______ ________ _______ |seller| | book | |process | | buyer | -------- -------- ---------- --------- | sID* | | bID* | | pID* | | byID* | | name | | XXX | --> | sID | |date &..| ---------- (*) indicates a primary key </pre> <p>this will work better I think, but how to get into work with <strong>Price offers</strong>?<br> yes, I can add a offer to the <em>process</em> class, so I've changed my mind &amp; this model came into the place: (sorry for long description)</p> The *Offer* field will be added to the *process* class: ______ ______ _________ _______ |seller| | book | |process | | buyer | -------- -------- ----------- --------- | sID* | | bID* | | pID* | | byID* | | name | | XXX | --> | sID | | offer | | date &..| ----------- (*) indicates a primary key </pre> <p>I'm absolutely confused with the db design due to it's my first time. Is this going to satisfy the system needs? If no, how can I make it work? If yes, is there any better design? </p> <p>Any suggestion is appreciated, thanks in advance :)</p> <p><em>update</em> - I really can't choose the best answer here, all helped. Many many many thanks guys. hope you best ^o^</p>
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    1. COHi artarad - can you explain what you mean by "multiple offers"?
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    2. COhihi :) buyers can offer their price to buy the book, so a single book can have just ONE buyer but N offerers.
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